Analyze optional parameters and regex parameters

[miyaji255]

Support for Routing Variants

• Optional Parameters
  For routes with optional path parameters (/users/:userId?), generate two route methods to support both variants: /users and /users/:userId.

• Regex Path Parameters
  For regex path parameters, skip template literal generation.

[codecov]

Codecov Report

Attention: Patch coverage is 98.14815% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/core/parsePath.ts	95.65%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/core/analyzeMethod.ts	90.38% <100.00%> (ø)
src/core/analyzeParameters.ts	83.51% <100.00%> (ø)
src/core/analyzeSchema.ts	94.64% <100.00%> (ø)
src/core/parsePath.ts	95.65% <95.65%> (ø)